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Haptic interfaces have existed for many years, but touch is still challenging to emulate. There is still plenty to be understood about how the mind develops a tactile sense of materials —
their softness, compliance, texture and so forth — from the delicate feedback between skin and brain. It’s not clear, for example, what the relevant coordinates are for tactile space: how we
categorize such sensual characteristics.
A new study of haptic sensation in virtual reality (VR) supplies a demonstration of how touch is acutely sensitive to other sensory cues, especially vision. Berger et al. tested users of a
VR system that generates an illusion of material objects from small vibrations delivered to handheld controllers in each hand1. When the vibrations are suitably synchronized, the user
experiences the sense of there being a single, material source located in the empty space between the hands. In the experiments this source could be rendered visually in the VR headset as a
vibrating white marble.
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